It is a common question: If my kettle can heat water for hot chocolate, can't I just heat the milk directly inside it?

The short answer is No. To keep your Luna Electric Kettle Pro working perfectly (and to keep your warranty intact), you should only ever boil fresh water.

Here is the breakdown of why other liquids are a recipe for disaster.

Reason 1: Milk Will Scorch and Burn

Unlike water, milk contains proteins, sugars, and fats.

• The Issue: The heating element at the bottom of the Luna is designed to boil water rapidly. If you put milk in, the sugars will caramelize and burn onto the bottom almost instantly.
• The Result: You will end up with a layer of black, burnt "char" on the stainless steel that is nearly impossible to scrub off. Plus, the smell of burnt milk will linger forever.

Reason 2: "Ghost Flavors" (Tea & Coffee)

You might be tempted to throw tea bags or coffee grounds directly into the kettle to brew a large batch.

• The Issue: Stainless steel is durable, but essential oils from coffee and tea leaves can leave a residue inside the spout and on the lid silicone.
• The Result: If you brew Chai Spice in the kettle today, your delicate Green Tea tomorrow will taste like spicy cloves. This cross-contamination (or "ghost flavor") ruins the purity of future brews.

Reason 3: Sensor Confusion

The Luna Pro is a smart device with sensitive temperature sensors.

• The Issue: These sensors are calibrated specifically for the density and boiling behavior of water.
• The Result: Thicker liquids like soup, cider, or milk heat differently. They can bubble over effectively or trick the sensor into shutting off too early (or too late), creating a messy overflow or a safety hazard.

What to Do Instead

For Hot Chocolate/Lattes:

1. Boil water in the Luna.
2. Pour the hot water into a mug containing your cocoa mix.
3. Add milk separately (warm it in a microwave or use a milk frother).

For Large Batch Tea:

1. Use the Luna to heat the water to the perfect preset (e.g., Black Tea).
2. Pour the water into a separate teapot or French Press containing your tea bags.

"Help! I Accidentally Boiled Milk!"

Emergency Cleaning Tip: If you or a houseguest made this mistake, don't panic.

1. Fill the kettle with a mixture of 50% water and 50% white vinegar.
2. Let it soak (do not boil) for an hour to loosen the burnt residue.
3. Gently scrub with a soft sponge (no steel wool!) and rinse thoroughly.